Form wall tie



May 5, 1942- D. M. DE cANlo 2,281,833

FORM WALL TIE Filed March 7, 1941 INVENTOR.. DO-/yzfzlc/f M E@ Camo,gm/Q24 Patented May 5, 1942 Dominick M. De Canio, chicago', 1'11.,assignor to Ul'liversalForm Clamp Co., Chicago, Ill., a cor-- porationof Illinois Application March 7, 1941, Serial No. 382,17 6

3 Claims.

This invention relates to ties for bonding together the side Walls ofconcrete-forms;

In constructions where the Wall forms are rela tively short, ties whichprevent outward bulging or expansion of the Walls alone are used. On theother hand, Where the form walls are of considerable length, it isnecessary to employ ties which not only prevent the walls from bulgingoutwardly, but also space the walls against bulging inwardly. In longWall constructions, it is common practice to use for the most part tierods not equipped with spacers, and to insert at intervals tie-rodsequipped with spacers,

A standard construction of tie-rod not employing spacers is illustratedin patent to Dietrich, No. 1,925,689, Sept. 5, 1933, wherein the tiemember is made up of a central element called the tie-rod, havingthreaded ends, and a pair of so-called stud-rods having threaded socketsin their inner ends which screw onto the threaded ends of the tie-rod,and threaded outer portions which extend through the form walls and thestringers and walers that brace the form walls externally, and receivenuts bearing against the outer sides of the walers.

A standard form of tie member, equipped with spacers to prevent inwardcollapse of the form walls, is disclosed in patent to McCarty, No.915,995, March 23, 1909, which comprises the central tie-rod havingthreaded ends, a pair of conical spacers, each having a threaded socketin its inner end to receive the threaded end of the tie-rod, and also athreaded socket in its outer end to receive the externally threadedinner end of a stud-rod.

In the structure employing no spacers, typically represented by theDietrich patent, aforesaid, it is necessary that the stud-rods be of atleast stock, in order to provide adequate threaded sockets at theirinner ends to receive the threaded ends of the tie-rod. On the otherhand, in the structure employing spacers, typically represented by theMcCarty patent, aforesaid, the stud-rods may be, and commonly are, madeof stock. Hence, in a job employing both types of tie-rods, it hasheretofore been necessary to provide stud-rods of different thicknessesand different structures.

An important object of the present invention has been to provide animproved structure of spacer, by the use of which identical stud-rodsand identical tie-rods can be employed on the job with both the morenumerous tie elements not employing spacers and the less numerous tieelements employing spacers. A further object of the invention has beento provide an improved structure of form wall tie that will save metalby permitting re-use of the elements to a greater extent than hasheretofore been possible. My present improvement provides a novelstructure of spacer which affords a wrench-hold, by which,-

when the walls have been taken down, a wrench may be applied and thespacer unscrewed from the tie-rod and removed for re-use.

An illustrative embodiment of the invention is shown in the accompanyingdrawing, in whieh- Fig. 1 is a top plan View, broken off at its ends,and broken out between its ends, of a relatively long form wallemploying tie elements not equipped with spacers, and other tie`elements having my improved spacers.

Fig. 2 is an enlarged vertical section taken on the line 2'-2 of Fig. 1

Fig. 3 is a side elevation, partly in lsngitudinal section, of myimprovedr spacer, also showing the same engaged with the threaded end ofthe` tie rod and the tapped end of the stud-rod.

Fig. 4 is a transverse section taken on the line 4--4` of Fig. 3.

Fig. 5 is an end view of the cone spacer, as seen from its smaller end.

Referring to the drawing, Ill designates the usual plank walls of theform that are externally supported by vertical stringers I I andhorizontal Walers I2.

A greater number of the tie elements are of the type having no spacers,and consist simply of central tie-rods I3 formed with threaded ends, andstud-rods I4 that extend through holes in the form Walls III, betweenadjacent stringere I I, and through holes in the walers I2; the outerend portions of the stud-rods being threaded to receive clamp nuts I5,and their inner ends having threaded sockets that engage with thethreaded ends of the tie-rod, all as disclosed in the aforesaid Dietrichpatent.

The structure of the tie element which embodies an important novelfeature of my present invention is more fully shown in Figs. 2, 3, 4 and5. This comprises the central tie-rod I3, which is identical with thetie-rods I3 shown in the central portion of Fig. 1, a pair of stud-rodsI6, and a cone spacer I'I located between and connecting each end of thetie-rod with the proximate end of the stud-rod IE. The structuralfeatures of this spacer are best shown in Figs. 3, 4, and 5, from whichit will be seen that the small end of the cone has a tapped socket I8that receives the threaded end of the tie-rod, While its Wide end, thatbears on the inner side of the form wall, has an integral shank I9 thatis formed with opposed iiat sides 20, which shank occupies a hole in theform wall I0, and constitutes a wrench-hold. Integral and continuouswith the shank I9 is an externally threaded coaxial stem 2| that screwsinto a tapped socket 22 in the meeting end of the stud-rod I6. Theexternally threaded stem 2I is of the same diameter and thread pitch asthe externally threaded end of the tie-rod I3, and the tapped socket 22is of the same diameter and thread pitch as the tapped socket is notrequired, the threaded end of the tie-rod I3 can be screwed directlyinto socket 22 of the stud-rod, as is shown in the two inner tie-rodstructures in Fig. 1.

The outer end portions of the stud-rod I6 are threaded, as in the caseof the stud-rods I4, and equipped with similar clamp nuts I5.

By reason of this construction, the stud-rods and tie-rods of all thetie elements, both those having spacers and those without spacers, maybe made structurally identical, thus substantially reducing costs ofmanufacture.

When the Walers, stringers and form walls have been removed, by applyinga wrench to the shank 20 of the spacers, the latter can be unscrewedfrom the tie-rods for re-use in a subsequent job, leaving only thetie-rods I3 imbedded in the concrete; the holes in the wall left by thespacers being plugged with concrete. This feature also substantiallyreduces the cost of the equipment.

I claim:

1. A device for maintaining the walls of a concrete wall form againstboth outward and inward bulging, comprising a central tie-rod, a pair ofspacer blocks having a screw-threaded connection to the respective endsof said tie-rods and adapted to bear on the inner sides of the formwalls, the ends of said blocks in contact with the form walls havingeach a shank adapted to occupy a hole in a form wall and formed with awrench-hold, stud-rods having a screw-thread- I8; so that, where thecone spacer ed connection to the respective Shanks identical with thescrew-threaded connection of said tierod to said spacer blocks, andclamps engaged with the outer ends of said stud-rods.

2. A device for maintaining the walls of a concrete wall form againstboth outward and inward bulging, comprising a central tie-rod havingthreaded ends, a pair of spacer blocks each having in its inner end atapped socket engaged by an end of said tie-rod and at its other endadapted to bear on the inner side of a form Wall, said other end havingan integral shank adapted to occupy a hole in said form wall and formedwith a wrench-hold, a threaded stem integral and continuous with saidshank and identical in diameter and thread pitch with the threaded endsof said tie-rod, stud-rods formed with tapped sockets in their innerends identical in diameter and thread pitch with the tapped sockets ofsaid spacer blocks vengaged with said threaded stems, and clamps engagedwith the outer ends of said stud-rods.

3. A device for maintaining the Walls of a concrete wall form againstboth outward and inward bulging, comprisingA a central tie-rod havingthreaded ends, a pair of spacer cones each having in its narrow end atapped socket engaged by an end of said tie-rod and at its broad endadapted to bear on the inner side of a form wall, said broad end havingan integral shank adapted to occupy a hole in said form Wall and formedwith opposed flattened sides creating a wrench-hold, a threaded stemintegral and continuous axially with said shank and identical indiameter and thread pitch with the threaded ends of said tie-rod,stud-rods formed with tapped sockets in their inner ends identical indiameter and thread pitch with the tapped sockets of said spacer blocksengaged with said threaded stems and with threaded outer end portions,and clamp nuts on said threaded outer end portions.

DOMINICK M. DE CANIO.

